Quote:
Originally Posted by LarryB
The fan noise is more acceptable at the low speed setting except it is accompanied by a strangely varying high pitched noise that doesn't occur or can't be heard on the high speed. (I tried lubricating the fan but that didn't help.)
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The high pitched whine is likely the re-circulation pump that moves the coolant around the system and through the heat exchangers - it will ramp up and down as the system calls for more heat.
As others have pointed out, there are mufflers for the exhaust that will remove a lot of the "jet engine" part of the sound.